CN103453538B - A kind of minimum discharge CFBB with three grades of desulphurization systems - Google Patents
A kind of minimum discharge CFBB with three grades of desulphurization systems Download PDFInfo
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- CN103453538B CN103453538B CN201310339388.3A CN201310339388A CN103453538B CN 103453538 B CN103453538 B CN 103453538B CN 201310339388 A CN201310339388 A CN 201310339388A CN 103453538 B CN103453538 B CN 103453538B
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Abstract
With a minimum discharge CFBB for three grades of desulphurization systems, before three grades of desulphurization systems are respectively and are positioned at Boiler Furnace coal yard region stokehole desulfuration agent add-on system, be positioned at the desulfuration in furnace agent induction system in boiler factory building region and be positioned at the degree of depth flue gas desulphurization system in boiler tail region; Stokehole desulfuration agent add-on system comprises stokehole desulfuration agent storehouse and the stokehole desulfuration agent Weighing type adding machine below it, desulfuration in furnace agent induction system comprises desulfuration in furnace agent storehouse and the conveying of the desulfuration in furnace agent below it batcher, degree of depth flue gas desulphurization system is also provided with the efficient desulfurizing agent circulatory system and flue gas supplements dust arrester; Present system is simple, operation energy consumption is low, regulable control is easy, sorbent utilization is high, without water resources consumption, desulfuration efficiency is high, can effectively save space and equipment investment, is widely used in the environmental transformation of the supporting and existing CFBB of new-built circulatory conveyor boiler environmental protection.
Description
Technical field
The present invention relates to Sector of Cfb Boilers, be specifically related to a kind of minimum discharge CFBB with three grades of desulphurization systems.
Background technology
China is coal production main in the world and country of consumption, is also take coal as the country of main primary energy.Containing pollutants such as a large amount of sulfur dioxide, nitrogen oxide and heavy metals in the flue gas that coal burning produces, cause serious environmental pollution.According to " 2012 China Environmental State Bulletin ", within 2012, national SO 2 in waste gas discharge capacity is up to 2117.6 ten thousand tons, and thermal power generation is one of main body of sulfur dioxide (SO2) emissions always.
For strengthen environmental protection, realize target for energy-saving and emission-reduction, " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011) specifies: be positioned at Guangxi Zhuang Autonomous Region, Chongqing City, Sichuan Province and Guizhou Province existing thermal power generation boiler perform 400mg/m
3sulfur dioxide (SO2) emissions limit value, newly-built thermal power generation boiler perform 200mg/m
3sulfur dioxide (SO2) emissions limit value, the existing thermal power generation boiler of other non-key areas performs 200mg/m
3sulfur dioxide (SO2) emissions limit value, newly-built thermal power generation boiler perform 100mg/m
3sulfur dioxide (SO2) emissions limit value, for the thermal power generation boiler of key area, the emission limit of sulfur dioxide is only 50mg/m
3.
Well-known China is CFBB installed capacity and the country that number of units is maximum, unit parameter is the highest that installs, and traditional CFBB mainly relies on desulfuration in furnace, and up-to-date environmental protection standard puts into effect these boilers rear to be needed to undergo technological transformation mostly.Desulfur technology domestic is at present based on Gypsum Wet, Limestone-gypsum Wet Flue Gas Desulfurization Process technique needs to consume a large amount of water resources, the gypsum discarded object produced not easily fully utilizes, be difficult in the area of northwest water resources shortage, ecological environment frailty adopt, in addition operating cost is high, if CFBB application Gypsum Wet very expensive, the thermal power plant of vast use CFBB in the urgent need to a kind of application conditions restriction less, the low and desulfur technology that efficiency is high of water consumption, for the transformation of new-built unit and original unit.
Chinese invention patent application 200810138603.2 discloses a kind of circulating fluid bed boiler flue calcium injection and desulfurization process, CaO powder is sent to the horizontal flue after the cyclone separator of temperature≤950 DEG C or the first steam superheater or/and there is desulphurization reaction in back-end ductwork, owing to only having first grade desulfurizing system, this mode obviously cannot meet the requirement of up-to-date environmental protection standard, in addition the expense of CaO is far above lime stone, because CaO granularity is comparatively thin, the time of staying is short, utilization rate is low, system operation cost is high.
Chinese patent application 02135540.1 discloses a kind of compound desulfurizing process of circulating fluidized bed boiler.This technique adds limestone particle in CFBB, carries out the outer humidification desulfurization of stove again, the final compound desulfurizing process forming stove combustion desulfurization and afterbody humidification desulfurization after first carrying out desulfuration in furnace in conditioning Tower.This technique improves the desulfuration efficiency of CFBB to a certain extent, but brings many new problems owing to needing to arrange conditioning Tower.The first, owing to needing the lime stone utilizing unreacted, before therefore the position of conditioning Tower must be arranged on deduster, difficult arrangement for existing CFBB; The second, humidification process water consumption own is comparatively large, can affect deduster and run after flue gas with water, the new problem such as bring dust exceeding, service life of equipment short; 3rd, the desulfuration efficiency of afterbody humidification desulfurization itself is not high, even if compound desulfurizing process, still cannot meet up-to-date environmental protection standard; 4th, the flying dust quality after adding water declines, and cannot fully utilize.
Chinese utility model patent 2009200003396.X discloses a kind of Novel coal-fired boiler desulfurizer of three sections of sweetening processes composition.This device is composed in series by CFBB, shrend activator and charged knockouts, carries out the desulfurization of circulating fluid bed boiler combustion and external desulfurzation agent shrend activation desulfurization and the outer charged activation desulfurization of stove respectively.Large, the charged knockouts power consumption of shrend activator water consumption that this technique uses is high, less economical.In addition, shrend activation and charged coacervation process itself can have an impact to flying dust activity, and the flying dust after adding water cannot carry out the higher comprehensive utilization of added value, and use value is had a greatly reduced quality, and also have no the open report using this technology at present.
Chinese invention patent application 200910112434.X discloses flue gas desulfurization enhancing device and desulfurization synergistic method after a kind of circulating fluid bed boiler.The method device is provided with reactor, deduster, absorbent is auxiliary adds system, Desulphurization recirculating system and fresh water (FW) system.Boiler smoke is introduced into reactor and the premixed of circulation desulfurization ash, lime stone generates quick lime powder after calcining in stove, the flying dust being mingled with quick lime powder enters downstream reactor with flue gas, quick lime directly reaction generation slaked lime desulfurizing reaction in reactor after spray cooling.The method needs a large amount of water spray to reduce flue-gas temperature equally, and require strict to process control parameter, otherwise desulfuration efficiency cannot ensure, water consumption is high, desulfuration efficiency is low, and flying dust cannot fully utilize, restricted application.Use this system if simple in addition, still cannot meet the requirement of up-to-date environmental protection standard.
Chinese invention patent application 201110330529.6 discloses a kind of CFBB three sections of desulfurizers.This device carries out desulfurization to flue gas in boiler, in cyclone separator and in semi-dry desulphurization device, this device flue outlet pipe adopts fork formula structure, the lower position that wherein a road is tangentially connected to the higher part position of semi-dry desulphurization device, another road is tangentially connected to semi-dry desulphurization device, owing to mainly using calcium hydroxide as desulfurizing agent and still needing water spray, water consumption is high, desulfuration efficiency is low, flying dust cannot fully utilize, restricted application, cannot meet the requirement of up-to-date environmental protection standard.
Obviously, prior art desulfuration efficiency is low, operating cost is high, flying dust poor quality cannot fully utilize, in addition retrofit work amount is large, water consumption is high, and the scope of application is little, for burning high sulfur coal and for the higher area of sulfur dioxide (SO2) emissions level of control, water-deficient area inapplicable.Existing CFBB is high in the urgent need to developing a kind of desulfuration efficiency, and operating cost is low, anhydrous consumption, the type smoke pollutant removal technique that improvement project amount is little, meets the requirement of national up-to-date environmental protection standard.
Summary of the invention
In order to overcome the shortcoming that above-mentioned prior art exists, the object of the present invention is to provide a kind of minimum discharge CFBB with three grades of desulphurization systems, present system is simple, operation energy consumption is low, regulable control is easy, sorbent utilization is high, without water resources consumption, desulfuration efficiency is high, can effectively save space and equipment investment, be widely used in the environmental transformation of the supporting and existing CFBB of new-built circulatory conveyor boiler environmental protection.
In order to achieve the above object, the present invention is by the following technical solutions:
A kind of minimum discharge CFBB with three grades of desulphurization systems, comprise three grades of desulphurization systems, before described three grades of desulphurization systems are respectively and are positioned at Boiler Furnace coal yard region stokehole desulfuration agent add-on system A, be positioned at the desulfuration in furnace agent induction system B in boiler factory building region and be positioned at the degree of depth flue gas desulphurization system C in boiler tail region; Described stokehole desulfuration agent add-on system A comprises stokehole desulfuration agent storehouse A1 and the stokehole desulfuration agent Weighing type adding machine A2 below it, and graininess desulfurizing agent adds on the raw coal belt conveyor 2 between coal yard raw coal 1 and raw coal pulverizing-screening system 3 by stokehole desulfuration agent storehouse A1 by stokehole desulfuration agent Weighing type adding machine A2; Described desulfuration in furnace agent induction system B comprises desulfuration in furnace agent storehouse B1 and the conveying of the desulfuration in furnace agent below it batcher B2, and desulfurizer powder is sent into burner hearth emulsion zone 7 by desulfuration in furnace agent conveying batcher B2 from feed back pipe 15 by desulfuration in furnace agent storehouse B1 and carried out desulfurization; Described degree of depth flue gas desulphurization system C is also provided with efficient desulfurizing agent circulatory system C1 and flue gas supplements dust arrester C2, flue gas after dedusting is cooled to the deep removal close to sending into degree of depth flue gas desulphurization system C after saturation temperature and carry out sulfur dioxide in flue gas by exhaust gas temperature attemperator 24, with after to supplement through flue gas and send into chimney 26 by air-introduced machine 25 after dust arrester C2 process and discharge, described efficient desulfurizing agent is recycled by efficient desulfurizing agent circulatory system C1.
Described stokehole desulfuration agent add-on system A, desulfuration in furnace agent induction system B and degree of depth flue gas desulphurization system C desulfurizing agent use amount separately independently regulate according to the difference of coal and SO 2 from fume concentration.
The graininess desulfurizing agent that described stokehole desulfuration agent add-on system A uses is lime stone, carbide slag, calcium hydroxide or other calcareous materials, and its particle diameter is 1 ~ 20mm, and meso-position radius is 1 ~ 5mm; The desulfurizer powder that described desulfuration in furnace agent induction system B uses is lime stone, carbide slag, calcium hydroxide or other calcareous materials, and its particle diameter is 0.1 ~ 1.5mm, and meso-position radius is 0.2 ~ 0.8mm; The efficient desulfurizing agent that described degree of depth flue gas desulphurization system C uses is lime stone, carbide slag, calcium hydroxide or other calcareous materials, utilizes chemical reaction to carry out desulfurization; Or efficient desulfurizing agent be active carbon, activated coke, active carbocoal have the medium of internal pore structure and adsorption capacity, utilizes adsorption reaction to carry out desulfurization.
Be added with sodium chloride or potassium chloride desulfurization hardening agent in the graininess desulfurizing agent that described stokehole desulfuration agent add-on system A uses and the desulfurizer powder that desulfuration in furnace agent induction system B uses, addition is that desulfurizing agent adds 1% ~ 15% of total amount.
Described desulfuration in furnace agent induction system B adopts Geldart-D particle, and the conveying source of the gas of desulfuration in furnace agent conveying batcher B2 is compressed air or hp fluid air.
Described CFBB comprises the raw coal belt conveyor 2 be connected successively with coal yard raw coal 1, raw coal pulverizing-screening system 3, as-fired coal belt conveyor 4, stove coal bunker 5, coal supply belt 6 and burner hearth emulsion zone 7, be communicated with slag cooler 9 by slag dropping tube 8 below burner hearth emulsion zone 7, slag cooler 9 is communicated with desulfuration in furnace cinder tank 27, it is burner hearth dilute-phase zone 10 above burner hearth emulsion zone 7, be communicated with separator 12 by separator inlet flue 11 above burner hearth dilute-phase zone 10, separator inlet flue 11 is provided with reducing agent spout 20, by standpipe 13 below separator 12, material returning valve 14 is communicated with burner hearth emulsion zone 7 with feed back pipe 15, be communicated with deduster 23 by back-end ductwork 21 above separator 12, back-end ductwork heating surface 22 is provided with in back-end ductwork 21, material returning valve 14 bottom is provided with circulating ash delivery pipe 16, circulating ash delivery pipe 16 communicates with circulating ash cooler 17, circulating ash cooler heating surface 18 is provided with in circulating ash cooler 17, circulating ash cooler 17 is communicated with desulfuration in furnace cinder tank 27 successively with circulation ash silo 19, be connected with exhaust gas temperature attemperator 24 above deduster 23, exhaust gas temperature attemperator 24 is connected with degree of depth flue gas desulphurization system C, be communicated with external desulfurzation cinder tank 28 below degree of depth flue gas desulphurization system C, be communicated with desulfuration in furnace cinder tank 27 below deduster 23.
The denitrification reducing agent that described reducing agent spout 20 sprays into is aqueous solution of urea, liquefied ammonia or ammoniacal liquor.
Cooling medium in described exhaust gas temperature attemperator 24 is demineralized water.
The ignition temperature of described CFBB is 850 ~ 950 DEG C.
Compared with prior art, the present invention has the following advantages:
1. system is simple, and retrofit work amount is little, and space hold is few and equipment investment is low, goes for the alteration of circulating fluidized bed boiler of different capacitance grade and newly-built;
2. three grades of desulfurization actings in conjunction, desulfuration efficiency is high, can stablize and realize sulfur dioxide in flue gas concentration of emission lower than 50mg/m
3;
3. anhydrous consumption, operation energy consumption are low, are particularly applicable to water-deficient area and near coal-mine area;
4. sweetening process does not affect the comprehensive utilization of lime-ash;
5. run and control conveniently, sorbent utilization is high, and adjusting function is good.
Namely the most significant feature of the present invention is that three grades of desulphurization systems act on simultaneously, guarantees final denitration efficiency.Such as, up-to-date standard often requires that desulfuration efficiency reaches more than 98%.But utilize merely in stove, outside stove, or in stove+stove outside be not easy to realize.If but to adopt in stokehold+stove+stove outside, triplicity effect, reduces the needs to every one-level, and system also can simplify.
Accompanying drawing explanation
Accompanying drawing is applicating flow chart of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention will be described in more detail.
As shown in Figure 1, a kind of minimum discharge CFBB with three grades of desulphurization systems of the present invention, comprise the raw coal belt conveyor 2 be connected successively with coal yard raw coal 1, raw coal pulverizing-screening system 3, as-fired coal belt conveyor 4, stove coal bunker 5, coal supply belt 6 and burner hearth emulsion zone 7, be communicated with slag cooler 9 by slag dropping tube 8 below burner hearth emulsion zone 7, slag cooler 9 is communicated with desulfuration in furnace cinder tank 27, it is burner hearth dilute-phase zone 10 above burner hearth emulsion zone 7, be communicated with separator 12 by separator inlet flue 11 above burner hearth dilute-phase zone 10, separator inlet flue 11 is provided with reducing agent spout 20, the concentration of emission of an enterprising step-down low NOx on the basis of CFBB low nitrogen burning.By standpipe 13 below separator 12, material returning valve 14 is communicated with burner hearth emulsion zone 7 with feed back pipe 15, be communicated with deduster 23 by back-end ductwork 21 above separator 12, back-end ductwork heating surface 22 is provided with in back-end ductwork 21, material returning valve 14 bottom is provided with circulating ash delivery pipe 16, circulating ash delivery pipe 16 communicates with circulating ash cooler 17, circulating ash cooler heating surface 18 is provided with in circulating ash cooler 17, circulating ash cooler 17 is communicated with desulfuration in furnace cinder tank 27 successively with circulation ash silo 19, when adding desulfurization dosage and being more, use circulating ash cooler 17 can reduce the ash concentration in stove, regulate boiler operatiopn operating mode, slow down wearing and tearing.Be connected with exhaust gas temperature attemperator 24 above deduster 23, exhaust gas temperature attemperator 24 is connected with degree of depth flue gas desulphurization system C, is communicated with, is communicated with below deduster 23 with desulfuration in furnace cinder tank 27 below degree of depth flue gas desulphurization system C with external desulfurzation cinder tank 28.Before described three grades of desulphurization systems are respectively and are positioned at Boiler Furnace coal yard region stokehole desulfuration agent add-on system A, be positioned at the desulfuration in furnace agent induction system B in boiler factory building region and be positioned at the degree of depth flue gas desulphurization system C in boiler tail region; Described stokehole desulfuration agent add-on system A comprises stokehole desulfuration agent storehouse A1 and the stokehole desulfuration agent Weighing type adding machine A2 below it, and graininess desulfurizing agent adds on the raw coal belt conveyor 2 between coal yard raw coal 1 and raw coal pulverizing-screening system 3 by stokehole desulfuration agent storehouse A1 by stokehole desulfuration agent Weighing type adding machine A2; Described desulfuration in furnace agent induction system B comprises desulfuration in furnace agent storehouse B1 and the conveying of the desulfuration in furnace agent below it batcher B2, and desulfurizer powder is sent into burner hearth emulsion zone 7 by desulfuration in furnace agent conveying batcher B2 from feed back pipe 15 by desulfuration in furnace agent storehouse B1 and carried out desulfurization; Described degree of depth flue gas desulphurization system C is also provided with efficient desulfurizing agent circulatory system C1 and flue gas supplements dust arrester C2, flue gas after dedusting is cooled to the deep removal close to sending into degree of depth flue gas desulphurization system C after saturation temperature and carry out sulfur dioxide in flue gas by exhaust gas temperature attemperator 24, with after to supplement through flue gas and send into chimney 26 by air-introduced machine 25 after dust arrester C2 process and discharge, described efficient desulfurizing agent is recycled by efficient desulfurizing agent circulatory system C1.
Stokehole desulfuration agent add-on system A of the present invention, desulfuration in furnace agent induction system B and degree of depth flue gas desulphurization system C desulfurizing agent use amount separately independently regulate according to the difference of coal and SO 2 from fume concentration, stokehole desulfuration agent add-on system A and desulfuration in furnace agent induction system B can remove 50% ~ 90% of burning generation sulfur dioxide altogether, and remainder is removed by degree of depth flue gas desulphurization system C.Final sulfur dioxide emissioning concentration can be low to moderate 50mg/m
3below.
As the preferred embodiment of the present invention, in order to improve desulfuration efficiency, the graininess desulfurizing agent that described stokehole desulfuration agent add-on system A uses is lime stone, carbide slag, calcium hydroxide or other calcareous materials, and its particle diameter is 1 ~ 20mm, and meso-position radius is 1 ~ 5mm; The desulfurizer powder that described desulfuration in furnace agent induction system B uses is lime stone, carbide slag, calcium hydroxide or other calcareous materials, and its particle diameter is 0.1 ~ 1.5mm, and meso-position radius is 0.2 ~ 0.8mm; The efficient desulfurizing agent that described degree of depth flue gas desulphurization system C uses is lime stone, carbide slag, calcium hydroxide or other calcareous materials, utilizes chemical reaction to carry out desulfurization; Or efficient desulfurizing agent be active carbon, activated coke, active carbocoal class have the medium of internal pore structure and adsorption capacity, utilizes adsorption reaction to carry out desulfurization.
Especially for the feature that some burning in circulating fluid bed boiler temperature domestic is high, be added with sodium chloride or potassium chloride salts substances desulfurization hardening agent in the graininess desulfurizing agent that described stokehole desulfuration agent add-on system A uses and the desulfurizer powder that desulfuration in furnace agent induction system B uses, addition is that desulfurizing agent adds 1% ~ 15% of total amount.Reduce the resolution ratio of calcium sulfate during burning, improve desulfuration efficiency, therefore the ignition temperature of CFBB is 850 ~ 950 DEG C.
As the preferred embodiment of the present invention, described desulfuration in furnace agent induction system B adopts Geldart-D particle, and the conveying source of the gas of desulfuration in furnace agent conveying batcher B2 is compressed air or hp fluid air.
As the preferred embodiment of the present invention, the denitrification reducing agent that described reducing agent spout 20 sprays into is aqueous solution of urea, liquefied ammonia or ammoniacal liquor.
As the preferred embodiment of the present invention, the cooling medium in described exhaust gas temperature attemperator 24 is demineralized water.
Desulfuration in furnace cinder tank 27 is delivered in the desulfuration in furnace desulfurization ash unification generated due to stokehole desulfuration agent add-on system A and desulfuration in furnace agent induction system B, and this part grey activity is higher, and may be used for the production of cement, brick and tile etc., value is higher.The external desulfurzation lime-ash that degree of depth flue gas desulphurization system C generates sends into external desulfurzation cinder tank 28, and due to containing calcium sulfite isoreactivity unstable material, this part ash may be used for the landfill in roadbed, mining area.
Operation principle of the present invention is: coal yard raw coal 1 enters raw coal pulverizing-screening system 3 by raw coal belt conveyor 2, stokehole desulfuration agent add-on system A is as first order desulphurization system, the graininess desulfurizing agent that stokehole desulfuration agent add-on system A uses is stored in stokehole desulfuration agent storehouse A1, add on raw coal belt conveyor 2 by stokehole desulfuration agent Weighing type adding machine A2, under the crushing and screening effect of raw coal pulverizing-screening system 3, graininess desulfurizing agent mixes the as-fired coal become containing graininess desulfurizing agent with raw coal, finally deliver to as-fired coal storehouse 5 by as-fired coal belt conveyor 4 for subsequent use.As-fired coal enters burner hearth emulsion zone 7 Thorough combustion by coal supply belt 6 and completes desulfurization in burning, and the desulfurizer powder that desulfuration in furnace agent induction system B uses is sent into burner hearth emulsion zone 7 by desulfuration in furnace agent conveying batcher B2 from feed back pipe 15 by desulfuration in furnace agent storehouse B1 and carried out desulfurization.Lime-ash enters slag cooler 9 by slag dropping tube 8 and cools rear feeding desulfuration in furnace cinder tank 27.The ash-laden gas that burning produces enters separator 12 via burner hearth dilute-phase zone 10 and separator inlet flue 11 respectively, major part dust is separated get off after through sending burner hearth emulsion zone 7 back to by standpipe 13, material returning valve 14, feed back pipe 15, flue gas then by back-end ductwork 21, enters deduster 23 after being cooled by back-end ductwork heating surface 22.The reducing agent spout 20 of separator inlet flue 11, for spraying denitrification reducing agent.The circulating ash delivery pipe 16 of circulating ash through material returning valve 14 bottom enters circulating ash cooler 17, and circulating ash sends into desulfuration in furnace cinder tank 27 after the cooling of circulating ash cooler heating surface 18.Flue gas in deduster 23 after dedusting is cooled to the deep removal close to sending into degree of depth flue gas desulphurization system C after saturation temperature and realize sulfur dioxide in flue gas by exhaust gas temperature attemperator 24, efficient desulfurizing agent can realize recycling by efficient desulfurizing agent circulatory system C1, and the lime-ash after deep desulfuration sends into external desulfurzation cinder tank 28.Degree of depth flue gas desulphurization system C self is also provided with flue gas and supplements dust arrester C2, and the flue gas after its process is finally sent into chimney 26 by air-introduced machine 25 and discharged.
Embodiment one
Be illustrated in figure 1 a newly-built 300MW grade recycle fluidized-bed combustion boiler, this boiler is with three grades of desulphurization systems.The ignition temperature of boiler is 900 DEG C, and stokehole desulfuration agent add-on system A uses the limestone particle of meso-position radius 3mm, sends into burner hearth emulsion zone 7 after the graininess desulfurizing agent Homogeneous phase mixing that coal yard raw coal 1 and stokehole desulfuration agent add-on system A use.Desulfuration in furnace agent induction system B carries the agstone of meso-position radius 0.5mm from feed back pipe 15 to burner hearth emulsion zone 7.Flue gas after desulfuration in furnace is sent into degree of depth flue gas desulphurization system C and is carried out deep desulfuration after exhaust gas temperature attemperator 24 is cooled to 100 DEG C, and the desulfurizing agent that degree of depth flue gas desulphurization system C uses is calcium hydroxide.Reducing agent spout 20 sprays aqueous solution of urea to separator inlet flue 11, the concentration of emission of an enterprising step-down low NOx on the basis of CFBB low nitrogen burning.
Stokehole desulfuration agent add-on system A, desulfuration in furnace agent induction system B, degree of depth flue gas desulphurization system C remove 40%, 30% and 25% of burning generation sulfur dioxide respectively, and run duration controls final sulfur dioxide emissioning concentration lower than 50mg/m mainly through desulfurizing agent induction system B in regulating stove and degree of depth flue gas desulphurization system C
3
Embodiment two
A newly-built 135MW grade recycle fluidized-bed combustion boiler, this boiler is with three grades of desulphurization systems.The ignition temperature of boiler is 935 DEG C, stokehole desulfuration agent add-on system A uses the limestone particle of meso-position radius 2mm, desulfuration in furnace agent induction system B uses the agstone of meso-position radius 0.3mm, the sodium chloride desulfurization hardening agent of desulfurizing agent total amount 3% is also added with for improving desulfuration efficiency, reduce the resolution ratio of calcium sulfate during burning, improve desulfuration efficiency.
Embodiment three
The 200MW grade recycle fluidized-bed combustion boiler of a transformation, this boiler was originally provided with desulfuration in furnace agent induction system B, for this boiler has increased stokehole desulfuration agent add-on system A and degree of depth flue gas desulphurization system C newly, by the final sulfur dioxide emissioning concentration of three grades of these boilers of desulfurization lower than 100mg/m
3.
Embodiment four
A newly-built 600MW grade recycle fluidized-bed combustion boiler, this boiler is with three grades of desulphurization systems.The ignition temperature of boiler is 880 DEG C, and stokehole desulfuration agent add-on system A uses the limestone particle of meso-position radius 3mm, and desulfuration in furnace agent induction system B uses the agstone of meso-position radius 0.4mm.Degree of depth flue gas desulphurization system C uses active coke absorption method to carry out deep desulfuration, and adsorbing saturated activated coke can discharge regeneration, and the activated coke after regeneration and new activated coke are supplemented by efficient desulfurizing agent circulatory system C1 and utilized.
Claims (9)
1. the minimum discharge CFBB with three grades of desulphurization systems, it is characterized in that: comprise three grades of desulphurization systems, before described three grades of desulphurization systems are respectively and are positioned at Boiler Furnace coal yard region stokehole desulfuration agent add-on system (A), be positioned at the desulfuration in furnace agent induction system (B) in boiler factory building region and be positioned at the degree of depth flue gas desulphurization system (C) in boiler tail region; Described stokehole desulfuration agent add-on system (A) comprises stokehole desulfuration agent storehouse (A1) and stokehole desulfuration agent Weighing type adding machine (A2) below it, and graininess desulfurizing agent adds on the raw coal belt conveyor (2) between coal yard raw coal (1) and raw coal pulverizing-screening system (3) by stokehole desulfuration agent storehouse (A1) by stokehole desulfuration agent Weighing type adding machine (A2); Described desulfuration in furnace agent induction system (B) comprises desulfuration in furnace agent storehouse (B1) and conveying batcher of the desulfuration in furnace agent below it (B2), and desulfurizer powder carries batcher (B2) to carry out desulfurization from feed back pipe (15) feeding burner hearth emulsion zone (7) by desulfuration in furnace agent storehouse (B1) by desulfuration in furnace agent; Described degree of depth flue gas desulphurization system (C) is also provided with the efficient desulfurizing agent circulatory system (C1) and flue gas supplements dust arrester (C2), flue gas after dedusting is cooled to the deep removal close to sending into degree of depth flue gas desulphurization system (C) after saturation temperature and carry out sulfur dioxide in flue gas by exhaust gas temperature attemperator (24), with after to supplement through flue gas and send into chimney (26) by air-introduced machine (25) after dust arrester (C2) process and discharge, described efficient desulfurizing agent is recycled by the efficient desulfurizing agent circulatory system (C1).
2. a kind of minimum discharge CFBB with three grades of desulphurization systems according to claim 1, is characterized in that: the respective desulfurizing agent use amount of described stokehole desulfuration agent add-on system (A), desulfuration in furnace agent induction system (B) and degree of depth flue gas desulphurization system (C) independently regulates according to the difference of coal and SO 2 from fume concentration.
3. a kind of minimum discharge CFBB with three grades of desulphurization systems according to claim 1, it is characterized in that: the graininess desulfurizing agent that described stokehole desulfuration agent add-on system (A) uses is lime stone, carbide slag, calcium hydroxide or other calcareous materials, its particle diameter is 1 ~ 20mm, and meso-position radius is 1 ~ 5mm; The desulfurizer powder that described desulfuration in furnace agent induction system (B) uses is lime stone, carbide slag, calcium hydroxide or other calcareous materials, and its particle diameter is 0.1 ~ 1.5mm, and meso-position radius is 0.2 ~ 0.8mm; The efficient desulfurizing agent that described degree of depth flue gas desulphurization system (C) uses is lime stone, carbide slag, calcium hydroxide or other calcareous materials, utilizes chemical reaction to carry out desulfurization; Or efficient desulfurizing agent be active carbon, activated coke, active carbocoal have the medium of internal pore structure and adsorption capacity, utilizes adsorption reaction to carry out desulfurization.
4. a kind of minimum discharge CFBB with three grades of desulphurization systems according to claim 3, it is characterized in that: be added with sodium chloride or potassium chloride desulfurization hardening agent in the graininess desulfurizing agent that described stokehole desulfuration agent add-on system (A) uses and the desulfurizer powder that desulfuration in furnace agent induction system (B) uses, addition is that desulfurizing agent adds 1% ~ 15% of total amount.
5. a kind of minimum discharge CFBB with three grades of desulphurization systems according to claim 1, it is characterized in that: described desulfuration in furnace agent induction system (B) adopts Geldart-D particle, the conveying source of the gas of desulfuration in furnace agent conveying batcher (B2) is compressed air or hp fluid air.
6. a kind of minimum discharge CFBB with three grades of desulphurization systems according to claim 1, it is characterized in that: described CFBB comprises the raw coal belt conveyor (2) be connected successively with coal yard raw coal (1), raw coal pulverizing-screening system (3), as-fired coal belt conveyor (4), stove coal bunker (5), coal supply belt (6) and burner hearth emulsion zone (7), burner hearth emulsion zone (7) below is communicated with slag cooler (9) by slag dropping tube (8), slag cooler (9) is communicated with desulfuration in furnace cinder tank (27), burner hearth emulsion zone (7) top is burner hearth dilute-phase zone (10), burner hearth dilute-phase zone (10) top is communicated with separator (12) by separator inlet flue (11), separator inlet flue (11) is provided with reducing agent spout (20), separator (12) below is by standpipe (13), material returning valve (14) is communicated with burner hearth emulsion zone (7) with feed back pipe (15), separator (12) top is communicated with deduster (23) by back-end ductwork (21), back-end ductwork heating surface (22) is provided with in back-end ductwork (21), material returning valve (14) bottom is provided with circulating ash delivery pipe (16), circulating ash delivery pipe (16) communicates with circulating ash cooler (17), circulating ash cooler heating surface (18) is provided with in circulating ash cooler (17), circulating ash cooler (17) is communicated with desulfuration in furnace cinder tank (27) successively with circulation ash silo (19), deduster (23) top is connected with exhaust gas temperature attemperator (24), exhaust gas temperature attemperator (24) is connected with degree of depth flue gas desulphurization system (C), degree of depth flue gas desulphurization system (C) below is communicated with external desulfurzation cinder tank (28), deduster (23) below is communicated with desulfuration in furnace cinder tank (27).
7. a kind of minimum discharge CFBB with three grades of desulphurization systems according to claim 6, is characterized in that: the denitrification reducing agent that described reducing agent spout (20) sprays into is aqueous solution of urea, liquefied ammonia or ammoniacal liquor.
8. a kind of minimum discharge CFBB with three grades of desulphurization systems according to claim 6, is characterized in that: the cooling medium in described exhaust gas temperature attemperator (24) is demineralized water.
9. a kind of minimum discharge CFBB with three grades of desulphurization systems according to claim 6, is characterized in that: the ignition temperature of described CFBB is 850 ~ 950 DEG C.
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| CN103900076B (en) * | 2014-03-24 | 2016-09-14 | 中国华能集团清洁能源技术研究院有限公司 | A kind of minimum discharge electricity generation system using low calorie fuels |
| CN103900077B (en) * | 2014-03-24 | 2016-01-20 | 中国华能集团清洁能源技术研究院有限公司 | A kind of integrated remodeling method reducing CFBB pollutant emission |
| CN104266179A (en) * | 2014-10-11 | 2015-01-07 | 中国电力工程顾问集团西南电力设计院 | Limestone two-stage adding system for CFB (Circulating Fluid Bed) boiler |
| CN105889933A (en) * | 2014-12-08 | 2016-08-24 | 赫拉(北京)环境保护技术有限公司 | Garbage incinerating device and method for conducting deacidification in garbage incinerator |
| CN104492248B (en) * | 2014-12-24 | 2016-05-25 | 西昌市蓝鼎环保科技有限公司 | For the dry method desulfuration system of high sulphur concentration flue gas |
| CN105135426A (en) * | 2015-09-08 | 2015-12-09 | 大同煤炭职业技术学院 | Regulating method for material returning exception of circulating fluidized bed boiler |
| CN109486534B (en) * | 2018-12-20 | 2021-06-08 | 中国平煤神马能源化工集团有限责任公司 | Coal gas dust removal and desulfurization method |
| CN113587104B (en) * | 2021-08-16 | 2024-04-05 | 昆明理工大学 | Waste pyrolysis waste gas purification system and process |
| CN113895863A (en) * | 2021-10-12 | 2022-01-07 | 新兴铸管股份有限公司 | Device and method for quickly assembling and disassembling active coke |
| CN114891549A (en) * | 2022-04-07 | 2022-08-12 | 珠海市胜彥节能环保科技有限公司 | Desulfurizing agent and preparation method and application thereof |
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